CN113270242A - All-inorganic high-temperature-resistant composite magnetic powder core and preparation method thereof - Google Patents
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- 239000006247 magnetic powder Substances 0.000 title claims abstract description 87
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 29
- 241001460678 Napo <wasp> Species 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 9
- 238000000748 compression moulding Methods 0.000 claims abstract description 7
- 239000000314 lubricant Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000011261 inert gas Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 claims description 4
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910020489 SiO3 Inorganic materials 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000011247 coating layer Substances 0.000 abstract description 12
- 239000002245 particle Substances 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 239000002105 nanoparticle Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 4
- 229910000702 sendust Inorganic materials 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229960000892 attapulgite Drugs 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 229910052625 palygorskite Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- -1 iron-silicon-aluminum Chemical compound 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910000275 saponite Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the technical field of magnetic components, in particular to an all-inorganic high-temperature-resistant composite magnetic powder core and a preparation method thereof, wherein the preparation method comprises the following steps: (1) adding FeSiAl metal soft magnetic powder into NaAlO2And (NaPO)3)6Heating and stirring the mixed solution uniformly, and drying to finish insulating coating; (2) adding a composite binder and a lubricant, and performing compression molding to obtain a composite magnetic powder core blank; the composite binder is NaOH and Na2SiO3A mixture of (a); (3) and (3) carrying out heat treatment on the composite magnetic powder core blank obtained in the step (2) in vacuum or inert gas or reducing atmosphere, cooling and spraying to obtain the all-inorganic high-temperature-resistant composite magnetic powder core. The all-inorganic high-temperature-resistant composite magnetic powder core prepared by the invention has the characteristics of controllable coating layer thickness, low loss, high magnetic conductivity and high temperature resistance.
Description
Technical Field
The invention relates to the technical field of magnetic components, in particular to an all-inorganic high-temperature-resistant composite magnetic powder core and a preparation method thereof.
Background
The sendust/sendust magnetic powder core is widely applied to the fields of communication, uninterruptible power supplies, solid laser power supplies, photovoltaic power generation systems and the like because of high saturation magnetic induction intensity and relatively low loss. The sendust/sendust material has power loss in an alternating magnetic field and is dominated by eddy current loss at high frequency. The eddy current among the particles can be blocked by insulating and coating the magnetic powder particles, and the eddy current loss of the magnetic powder core is reduced, so that the iron-silicon-aluminum/iron-silicon magnetic powder core with high magnetic conductivity and low loss is obtained.
The use of organic polymers as insulating agents and binders has been commercialized. The organic resin is adopted to coat the magnetic powder particles, so that the resistivity of the powder core can be obviously improved, and the loss of the magnetic powder core can be reduced. More importantly, the organic polymer has poor high temperature resistance, the general heat-resistant temperature is not more than 500 ℃, and the conventional heat treatment temperature can reach 600-800 ℃.
In recent years, inorganic insulating agents such as phosphates and ceramic oxide coatings have received much attention and have been under some progress. However, the chemical stability and structural stability of the phosphated coating are poor, and as the annealing temperature increases, the coating insulation decreases, resulting in increased losses. When ceramic oxide is adopted for coating, the material can withstand higher heat treatment temperature, but the adhesion between the oxide coating layer and the powder core is poor, so that good insulating coating is difficult to form on the surface of the powder core, meanwhile, the thickness of the oxide coating layer is difficult to control, the thickness of the insulating coating layer is difficult to control on a nanometer scale, and along with the increase of the thickness of the insulating coating material, the air gap rate inside the powder core is increased, so that the magnetic permeability of the magnetic powder core can be reduced. More importantly, the excessive oxide coating can lead to uneven insulation coating, the powder core is easy to crack in the compression molding process, and the eddy current loss of the magnetic core is increased. Therefore, how to select a proper all-inorganic coating material and a proper coating thickness is a great challenge to realize a high-permeability and low-loss powder core.
Chinese patent literature discloses a ferrite composite magnetic powder core and a preparation method thereof, the application publication number of which is CN103426584A, and the invention adopts nickel-zinc ferrite nano particles prepared by a hydrothermal method to coat magnetic powder to prepare the novel nickel-zinc ferrite composite magnetic powder core. However, in this patent, the ferrite and the magnetic powder are in solid-solid contact, so that the wettability is poor, and it is difficult to form a good coating. In addition, the values of permeability and loss of the product are not mentioned in this patent either.
Chinese patent literature discloses an inorganic insulating binder for a metal soft magnetic powder core, the application publication number of which is CN101089108A, the inorganic insulating binder of the invention is made of SiO2、Al2O3、ZrO2Mica powder and water, and has the double effects of insulation and bonding. However, the ceramic oxide and other materials used in the patent are insoluble in water, and it is difficult to obtain an aqueous solution with uniform distribution, so that the uniformity and thickness of the insulating binder coated on the surface of the magnetic powder are difficult to control, the Q value is low, and the loss is increased.
The Chinese patent literature discloses a method for coating and bonding a metal magnetic powder core by using inorganic gel, the application publication number of the method is CN109616273A, the coating agent of the method is one or two of magnesium aluminum silicate, saponite, bentonite and montmorillonite, and the binder is attapulgite. The inorganic gel coating layer is high temperature resistant, and reduces the cost and loss of the magnetic powder core. However, in the patent, because the particle sizes of the magnesium aluminum silicate, the attapulgite and the like are in the micron order, the uniform distribution in the gel is difficult to realize, and the gel has poor fluidity in the magnetic powder and can generate an agglomeration phenomenon. Meanwhile, the gaps between large particles are difficult to fill, so that the magnetic permeability is reduced. Moreover, the metal magnetic powder needs to be passivated and treated, which increases the preparation cost.
Based on the above problems, it is significant to design a new all-inorganic high temperature resistant insulating coating agent to simultaneously realize high magnetic permeability and low loss of the metal magnetic powder core.
Disclosure of Invention
The invention provides a preparation method of an all-inorganic high-temperature-resistant composite magnetic powder core, which aims to solve the problems of uncontrollable coating layer thickness, easy cracking, low magnetic powder core magnetic conductivity, high loss and poor high-temperature resistance of the existing magnetic powder core insulation coating process, and has the advantages of low cost, simple operation and easy large-scale production.
The invention also provides the all-inorganic high-temperature-resistant composite magnetic powder core prepared by the preparation method, and the magnetic powder core has the characteristics of controllable coating thickness, low loss, high magnetic conductivity and high temperature resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an all-inorganic high-temperature-resistant composite magnetic powder core comprises the following steps:
(1) adding FeSiAl metal soft magnetic powder into NaAlO2And (NaPO)3)6Heating and stirring the mixed solution uniformly, and drying to finish insulating coating; NaAlO2And (NaPO)3)6The mixed solution has good fluidity and wettability, and NaAlO is controlled2And (NaPO)3)6The proportion of (A) can be regulated and controlled, and Al (OH) generated by hydrolysis3The FeSiAl soft magnetic powder can be uniformly and compactly coated on the outer surface of the FeSiAl soft magnetic powder; the concentration and the dosage of the mixed solution can be controlled, and the final Al can be controlled on the nanometer scale2O3The thickness of the coating layer effectively prevents the coating layer from cracking, improves the resistivity of the magnetic powder core and reduces the loss;
(2) adding a composite binder into the FeSiAl metal soft magnetic powder subjected to the insulation coating treatment in the step (1), fully stirring, keeping the temperature at 90-100 ℃ for 20-40 min, drying, adding a lubricant, and performing compression molding to obtain a composite magnetic powder core blank; the composite binder is NaOH and Na2SiO3A mixture of (a); using NaOH and Na2SiO3The mixture is used as a composite binder, and the composite binder has good adhesiveness and high temperature resistance, and can prevent the device from losing effect in high-temperature use
(3) And (3) carrying out heat treatment on the composite magnetic powder core blank obtained in the step (2) in vacuum or inert gas or reducing atmosphere, cooling and spraying to obtain the all-inorganic high-temperature-resistant composite magnetic powder core. Al (OH) coated on the outer surface of the FeSiAl metal soft magnetic powder in the heat treatment process3Decomposition to Al2O3Nanoparticles, Al while achieving coating2O3The nanoparticles can be filled in the large particles and the large particles in the magnetic powder coreThe micro-gaps between the particles reduce the gap degree, increase the density of the powder core and obtain higher magnetic conductivity.
Preferably, in the step (1), the NaAlO is based on the total mass of the FeSiAl metal soft magnetic powder2And (NaPO)3)6The mixed solution of (A) comprises 0.05-3 wt% of NaAlO20.01 to 0.08wt% (NaPO)3)6And 10 to 15wt% of water. The final Al can be controlled on the nanometer level by adjusting the concentration and the dosage of the aqueous solution2O3The thickness of the coating layer effectively prevents the coating layer from cracking, improves the resistivity of the magnetic powder core and reduces the loss.
Preferably, the NaAlO2And (NaPO)3)6The mixed solution of (A) comprises 0.1-2 wt% of NaAlO20.02 to 0.05wt% (NaPO)3)6。
NaAlO2And (NaPO)3)6The aqueous solution has good fluidity and wettability by controlling NaAlO2And (NaPO)3)6The hydrolysis reaction can be regulated and controlled. Al (OH) formed by hydrolysis3Can be uniformly and compactly coated outside the magnetic powder core and decomposed into Al in the subsequent thermal annealing treatment process2O3Nanoparticles, Al while achieving coating2O3The nano particles can fill micro gaps between large particles in the magnetic powder core, so that the gap degree is reduced, the density of the powder core is increased, and higher magnetic conductivity is obtained.
Preferably, the heating temperature is 80-100 ℃, and the drying temperature is 90-120 ℃.
Preferably, in the step (2), the composite binder is 0.5-5 wt% of Na based on the total mass of the FeSiAl metal soft magnetic powder2SiO3And 0.002-0.02 wt% of NaOH.
Preferably, the composite binder consists of 1-3 wt% of Na2SiO3And 0.005-0.015 wt% of NaOH. .
Preferably, in the step (2), the lubricant is added in an amount of 0.5 to 1.0 wt% based on the total mass of the FeSiAl metal soft magnetic powder.
Preferably, in the step (2), the lubricant is one or two of zinc stearate and barium stearate.
Preferably, in the step (3), the heat treatment temperature is 600-780 ℃ and the time is 0.5-2 h.
An all-inorganic high-temperature-resistant composite magnetic powder core prepared by the preparation method.
Therefore, the invention has the following beneficial effects:
(1) the coating agent used by the invention is water-soluble, has good fluidity and wettability, and can realize uniform and compact coating of the magnetic powder core, thereby improving the resistivity of the magnetic powder core and reducing the power loss; the preparation method is simple, has low cost and no pollution to the environment, and is suitable for mass production;
(2) the all-inorganic high-temperature-resistant composite magnetic powder core prepared by the preparation method has the characteristics of controllable coating layer thickness, low loss, high magnetic conductivity and high temperature resistance.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples.
In the present invention, all the equipment and materials are commercially available or commonly used in the art, and the methods in the following examples are conventional in the art unless otherwise specified.
Example 1
(1) Adding FeSiAl metal soft magnetic powder into NaAlO2And (NaPO)3)6Heating and stirring the mixed solution at 80 ℃ for 30min until the mixed solution is uniformly mixed, and drying the mixed solution at 100 ℃ to finish insulating coating; the NaAlO is based on the total mass of the FeSiAl metal soft magnetic powder2And (NaPO)3)6The mixed solution of (A) contains 0.1 wt% of NaAlO20.02wt% of (NaPO)3)6And 10 wt% water; NaAlO is added2Dissolving in deionized water and adding (NaPO)3)6Adding, magnetically stirring for 30 minutes to obtain a colorless transparent solution for later use;
(2) after the step (1) of insulating coatingAdding a composite binder into the treated FeSiAl metal soft magnetic powder, fully stirring, and drying at 95 ℃ for 30 min; then adding zinc stearate accounting for 0.5 wt% of the total mass of the FeSiAl metal soft magnetic powder, and performing compression molding under 1500MPa to obtain a composite magnetic powder core blank with the outer diameter of 33.00mm, the inner diameter of 19.90mm and the height of 10.7 mm; the composite binder is composed of 1 wt% of Na2SiO3And 0.01 wt% NaOH;
(3) and (3) carrying out heat treatment on the composite magnetic powder core blank obtained in the step (2) at the temperature of 700 ℃ in vacuum for 45min, cooling and spraying to obtain the all-inorganic high-temperature-resistant composite magnetic powder core.
Example 2
(1) Adding FeSiAl metal soft magnetic powder into NaAlO2And (NaPO)3)6Heating and stirring the mixed solution at 100 ℃, and drying the mixed solution at 90 ℃ to finish insulating coating; the NaAlO is based on the total mass of the FeSiAl metal soft magnetic powder2And (NaPO)3)6The mixed solution of (A) contains 0.2 wt% of NaAlO20.02wt% of (NaPO)3)6And 10 wt% water;
(2) adding a composite binder into the FeSiAl metal soft magnetic powder subjected to the insulation coating treatment in the step (1), fully stirring, keeping the temperature at 90 ℃ for 40min, drying, adding zinc stearate accounting for 0.8 wt% of the total mass of the FeSiAl metal soft magnetic powder and barium stearate accounting for 0.2 wt% of the total mass of the FeSiAl metal soft magnetic powder, and performing compression molding under the pressure of 1800MPa to obtain a composite magnetic powder core blank with the outer diameter of 33.00mm, the inner diameter of 19.90mm and the height of 10.7 mm; the composite binder consists of 2wt% of Na2SiO3And 0.01 wt% NaOH;
(3) and (3) carrying out heat treatment on the composite magnetic powder core blank obtained in the step (2) in nitrogen at the temperature of 600 ℃ for 2h, cooling and spraying to obtain the all-inorganic high-temperature-resistant composite magnetic powder core.
Example 3
(1) Adding FeSiAl metal soft magnetic powder into NaAlO2And (NaPO)3)6Heating and stirring the mixed solution at 90 ℃, and drying the mixed solution at 120 ℃ to finish insulating coating; the NaAlO is based on the total mass of the FeSiAl metal soft magnetic powder2And (NaPO)3)6The mixed solution of (1) includes 0.3wt% NaAlO20.02wt% of (NaPO)3)6And 10 wt% water;
(2) adding a composite binder into the FeSiAl metal soft magnetic powder subjected to the insulation coating treatment in the step (1), fully stirring, keeping the temperature at 100 ℃ for 20min, drying, adding barium stearate accounting for 0.8 wt% of the total mass of the FeSiAl metal soft magnetic powder, and performing compression molding under the pressure of 2000MPa to obtain a composite magnetic powder core blank with the outer diameter of 33.00mm, the inner diameter of 19.90mm and the height of 10.7 mm; the composite binder is composed of 3wt% of Na2SiO3And 0.01 wt% NaOH;
(3) and (3) carrying out heat treatment on the composite magnetic powder core blank obtained in the step (2) in hydrogen at the temperature of 780 ℃ for 0.5h, cooling and spraying to obtain the all-inorganic high-temperature-resistant composite magnetic powder core.
The magnetic powder cores prepared in examples 1 to 3 were subjected to performance tests, and the results are shown in the following table:
the coating process adopted by the invention ensures that the magnetic powder coating layer is thin, uniform and compact, the magnetic conductivity is high, and the loss is greatly reduced. The invention is easy for scale production and has good application prospect.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (10)
1. The preparation method of the all-inorganic high-temperature-resistant composite magnetic powder core is characterized by comprising the following steps of:
(1) adding FeSiAl metal soft magnetic powder into NaAlO2And (NaPO)3)6Heating and stirring the mixed solution uniformly, and drying to finish insulating coating;
(2) adding a composite binder and a lubricant into the FeSiAl metal soft magnetic powder subjected to the insulation coating treatment in the step (1), and performing compression molding to obtain a composite magnetic powder core blank; the composite binderIs NaOH and Na2SiO3A mixture of (a);
(3) and (3) carrying out heat treatment on the composite magnetic powder core blank obtained in the step (2) in vacuum or inert gas or reducing atmosphere, cooling and spraying to obtain the all-inorganic high-temperature-resistant composite magnetic powder core.
2. The method according to claim 1, wherein in the step (1), the NaAlO is added based on the total mass of the FeSiAl metal soft magnetic powder2And (NaPO)3)6The mixed solution of (A) comprises 0.05-3 wt% of NaAlO20.01 to 0.08wt% (NaPO)3)6And 10 to 15wt% of water.
3. The method of claim 2, wherein the NaAlO is2And (NaPO)3)6The mixed solution of (A) comprises 0.1-2 wt% of NaAlO2And 0.02 to 0.05wt% (NaPO)3)6。
4. The method according to claim 1, wherein the heating temperature in the step (1) is 80 to 100%oC, the drying temperature is 90-120 DEG C oC。
5. The preparation method according to claim 1, wherein in the step (2), the composite binder is composed of 0.5-5 wt% of Na based on the total mass of the FeSiAl metal soft magnetic powder2SiO3And 0.002-0.02 wt% of NaOH.
6. The preparation method according to claim 5, wherein the composite binder is prepared from 1-3 wt% of Na2SiO3And 0.005-0.015 wt% of NaOH.
7. The preparation method according to claim 1, wherein in the step (2), the lubricant is added in an amount of 0.5 to 1.0 wt% based on the total mass of the FeSiAl metal soft magnetic powder; the lubricant is one or two of zinc stearate and barium stearate.
8. The production method according to claim 1, wherein in the step (2), the pressure of the press molding is 1500 to 2000 MPa.
9. The method according to claim 1, wherein the heat treatment temperature in step (3) is 600 to 780 ℃ for 0.5 to 2 hours.
10. An all-inorganic high-temperature-resistant composite magnetic powder core prepared by the preparation method of any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116825468A (en) * | 2023-08-04 | 2023-09-29 | 广东泛瑞新材料有限公司 | Iron-cobalt magnetic core and preparation method and application thereof |
| CN116833407A (en) * | 2023-05-09 | 2023-10-03 | 中南大学 | Soft magnetic composite material and preparation method thereof |
| CN118173371A (en) * | 2024-04-22 | 2024-06-11 | 国网智能电网研究院有限公司 | High-saturation-resistance iron-silicon-aluminum soft magnetic powder core and preparation method and application thereof |
-
2021
- 2021-04-15 CN CN202110407003.7A patent/CN113270242A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116833407A (en) * | 2023-05-09 | 2023-10-03 | 中南大学 | Soft magnetic composite material and preparation method thereof |
| CN116833407B (en) * | 2023-05-09 | 2024-03-01 | 中南大学 | Soft magnetic composite material |
| CN116825468A (en) * | 2023-08-04 | 2023-09-29 | 广东泛瑞新材料有限公司 | Iron-cobalt magnetic core and preparation method and application thereof |
| CN116825468B (en) * | 2023-08-04 | 2024-01-12 | 广东泛瑞新材料有限公司 | Iron-cobalt magnetic core and preparation method and application thereof |
| CN118173371A (en) * | 2024-04-22 | 2024-06-11 | 国网智能电网研究院有限公司 | High-saturation-resistance iron-silicon-aluminum soft magnetic powder core and preparation method and application thereof |
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